Display Power Circuit With Integrated Standby Overvoltage Protection
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Solution Overview
Problem
Conventional power generation parts in display devices have complex circuits that increase implementation costs and fail to provide stable direct current power due to separate circuits for overvoltage protection, power consumption minimization, and fault protection, with overvoltage protection being impossible in standby mode.
Innovation Solution
A display device with a power generation part and IC chip that integrates voltage monitoring and control, using a converter to supply power, an IC chip to provide feedback signals based on threshold voltages, and a standby circuit to reduce voltage, thereby eliminating the need for separate protection circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are used for overvoltage protection, power consumption minimization, and fault protection, then each function can be independently implemented, but the circuit complexity increases and implementation cost increases
Solution Approach 1:
The patent combines multiple protection functions (overvoltage protection, power consumption minimization, and fault protection) into a single integrated circuit. This integration reduces the overall circuit complexity and implementation cost while maintaining all necessary protection capabilities, directly resolving the contradiction between reliable protection and circuit complexity.
Solution Approach 2:
The integrated circuit is designed to perform multiple functions simultaneously - monitoring voltage levels, controlling power consumption, and detecting faults. This multi-functional approach allows a single circuit to replace what would traditionally require multiple separate circuits, thereby reducing complexity while preserving comprehensive protection.
2Loss of energy
If the node A and the node B are opened by the second circuit to reduce standby power consumption, then power consumption is minimized, but overvoltage protecting operation becomes impossible in standby mode
Solution Approach 1:
The patent introduces a third circuit that acts as an intermediary with a reference voltage source. This reference voltage allows the integrated circuit to continuously monitor the voltage at node A even when nodes A and B are opened for power saving. The monitoring capability is maintained through this intermediary reference, enabling overvoltage protection to function during standby mode while still minimizing power consumption.
Data Source
AI summary
A display device includes a power generation part including a converter and configured to supply power to a display panel and a main circuit that are in the display device; and an integrated circuit (IC) chip configured to provide a feedback signal to the power generation part based on a voltage outputted from the power generation part being equal to or higher than a first threshold voltage, wherein the power generation part is further configured to stop a switching operation of the converter based on the feedback signal.